Apparatus and method to correct a reference voltage

Details Apparatus and method to correct a reference voltage Apparatus and method to correct a reference voltage

2005-11-01

2005-11-01

Cho, James H. (Department: 2819)

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Signal level or switching threshold stabilization

C326S030000, C327S538000

Reexamination Certificate

active

06960932

ABSTRACT:
An apparatus and method thereof to correct a reference voltage, Vref, include a first digital device and a second digital device to input/output digital data via a bus, an adjustable resistor providing a main supply voltage VDD, a fixed resistor, wherein the adjustable resistor and the fixed resistor generate a Vref correction by dividing the main supply voltage VDD. A Vref setup selecting part of the apparatus and method selects the Vref correction and a Vref controller changes a resistance value of the adjustable resistor according to a selection of the Vref correction through the Vref setup selecting part, determines an optimum resistance value of the adjustable resistor, and outputs an optimum Vref correction.

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